> BTW, that's the default values for analyze... the defaults for vacuum
> are 2x that.
Yeah - I was actually more concerned that tables would need to be
analyzed more often than I was about vacuuming too often, so I used
analyze as the example. Since my app is inserting constantly throughout
the day and querying for "recent" data - I want to make sure the query
planner realizes that there are lots of rows with new timestamps on
them. In other words, if I run a query "select * from mytable where
timestamp > '9:00am'" - I want to make sure it hasn't been a day since
the table was analyzed, so the planner thinks there are zero rows
greater than 9:00am today.
> What's more important
> is to make sure critical tables (such as queue tables) are getting
> vacuumed frequently so that they stay small.
Is the best way to do that usually to lower the scale factors? Is it
ever a good approach to lower the scale factor to zero and just set the
thresholds to a pure number of rows? (when setting it for a specific
table)
Thanks,
Jeremy Haile